34 



OCEANIC TINTINNOINA OF LAST CRUISE OF CARNEGIE 



ones, and the distal row has about 10 somewhat larger, 

 rounded ones. The latter row is less regular than either of 

 the others. A few isolated, scattered lenestrae also occur 

 here and there. The interfenestral surface is reticulated, and 

 the framework of the collar has large primary alveoles. The 

 collar windows are all open. 



Length, 62^. 



Loricae of Dictyocysta lepida are commonly confused 

 with those of the more frequent D. reticulata, which species 

 has a single row of fenestrae, a flatter-sided middle bowl, 

 and a relatively longer collar. Dictyocysta lepida is not so 

 squat as D. lata, so big as D. grandis, nor so pointed aborally 

 as D. mexicana. 



Recorded from two stations in the Pacific, as follows: one 

 (109) in the North Pacific trade region, and one (137) in 

 the California region. 



There are 1 pump and 1 net sample, the former taken at 

 100 meters, the latter at 50 meters. Frequency, minimum. 



Temperature: pump sample ig?8i, net sample 24? 84. 

 Salinity: pump sample 34.86, net sample 35.12. Density: 

 pump sample 24.72, net sample 23.50. pH: pump sample 

 8.18, net sample 8.34. 



Dictyocysta magna Kofoid and Campbell 

 Dictyocysta magna Kofoid and Campbell, 1929, p. 294, fig. 569. 



The tall, wide lorica, with elegans-Yike fenestration and 

 conical bowl, has a length of 1.44 oral diameters. The oral 

 margin is only slightly undulating and has a thin vertical 

 list. The collar has a length of 0.48 total length and is sub- 

 cylindrical, the diameter at the throat being 1.12 oral diam- 

 eters. It has an upper row of 8 squarish windows with 

 rounded edges, and a lower row of 10 subrectangular ones 

 which are subequal to those of the upper row. The beams 

 and mullions are hyaline, rather heavy, rounded, and 

 thick. All are open. The bowl is acorn-like with a trace of 

 shoulder, the upper seven-tenths being within 52 , and 

 the remaining part 113 . The aboral end is obtuse and 

 blunted. 



The wall of the bowl has an equatorial row of 12 large, 

 subequal, subcircular fenestrae, and a second row of smaller 

 ones in similar number below the major row. A third row 

 of 6 yet smaller ones is below the second row, and a cluster 

 of tiny ones is found near the aboral end. The interfenestral 

 space is filled with tiny, subequal, prevailingly subcircular 

 areas. All fenestrae are closed by thin, hyaline panes. 



Length, 75 to 95U. 



Dictyocysta magna is unusually large. It differs from D. 

 mulleri not only in general surface pattern, but also in the 

 shape of the collar. It has a more pointed bowl than either 

 D. ampla or D. inaequalis, and is unlike all three species in 

 its collar fenestrae, all of which are subequal. It is not so 

 large as D. grandis, but has a double row of collar fenestrae 

 and not a single row as in grandis. 



Recorded from two stations (3, 5-6) in the Atlantic drift. 



There is 1 net sample from the surface, and 1 pump 

 sample from 50 meters. Frequency, 9 per cent at station 3. 



Temperature (station 3 only), 14^66; salinity, 35.96; den- 

 sity, 26.81; pH, 8.19. 



Dictyocysta minor Jorgensen 

 Dictyocysta minor, Kofoid and Campbell, 1929, p. 295, fig. 550. 



The small, stout lorica, with mitrahke fenestration but 

 with small subuniform windows near the bowl, has a length 

 of 1.39 oral diameters. The oral margin has 8 flat arches. 

 The collar is truncated subcorneal, flaring (15°), straight- 

 sided, with a diameter of 0.92 oral diameter at the neck, and 

 with 8 subequal, rounded rectangular windows. The bowl 

 is plump, reaching 1.08 oral diameters at or near the middle. 

 The aboral end is obtusely pointed. 



The bowl has 4 vertical, unequal rows of subpentagonal, 

 subhexagonal, or even squarish fenestrae, 10 to 12, 8 to 10, 

 12 to 14, 6 to 9, respectively, in number horizontally. In- 

 terpolated are minute fenestrae, and near the aboral end are 

 clustered about 40 very tiny ones. The framework of the 

 collar is heavy, thick, and lifted above the surface. The 

 windows have neat frames, and appear to be closed with 

 hyaline panes. 



Length, 47 to 54^1. 



Dictyocysta minor, though it has the mitra type of wall 

 structure, differs from D. mitra not only in having aboral 

 clusters of small fenestrae, but also in being shorter and 

 wider. Dictyocysta dilatata is somewhat similar but has an 

 aboral spine, more flaring collar, and slimmer proportions, 

 and lacks the small fenestrae. 



Recorded from sixteen stations, ten in the Atlantic and six 

 in the Pacific, as follows: one (3) in the Atlantic drift, three 

 (14, 15, 16) in the Gulf Stream, three (18, 19, 20) in the 

 Sargasso Sea, three (22, 23, 24) in the Atlantic equatorial 

 region, two (46, 47) in the Galapagos region, three (63, 64, 

 65) in the South Pacific middle latitudes, and one (no) in 

 the North Pacific trade region. 



There are 9 pump and 1 1 net samples, of which 2 were 

 taken at the surface, 5 at 50 meters, and 13 at 100 meters. 

 Maximum frequency, 10 per cent at station no; other records 

 above minimum (all 3 per cent) from stations 16, 18, 63, 64; 

 average in Atlantic net samples, 4.2 per cent. 



Temperature: Atlantic, pump samples i4?02-23?64( 1 8?35), 

 net samples i4?02-24?io (19? 19); Pacific, i5?03-i7?96 

 (i6?i8) and 23?30-23?88 (23^59), respectively. Salinity: 

 Atlantic, pump samples 35.10-36.48 (36.00), net samples 

 35.59-37.05 (36.29); Pacific, 34.30-34-73 (34-53) an d 35-32- 

 35.96 (35.64), respectively. Density: Atlantic, pump samples 

 24.84-26.66 (25.97), net samples 24.49-26.81 (25.76); Pacific, 

 25.10-25.48 (25.46) and 24.11-24.42 (24.36), respectively. 

 pH: Atlantic, pump samples 8.06-8.23 (8.16), net samples 

 8.06-8.25 (8.17); Pacific, 8.16-8.23 (8.19) and 8.08-8.14 

 (8.10), respectively. 



Dictyocysta mitra Haeckel emended Kofoid and Campbell 



(Figures 60, 61) 

 Dictyocysta mitra, Kofoid and Campbell, 1929, p. 296, fig. 548; 

 Hofker, 1931, pp. 381-382, figs. 74-75. 



The relatively plump lorica, with scant division between 

 collar and bowl, large, window-like meshwork, and rounded 

 aboral end, has a length of 1.47 oral diameters. The oral 

 rim is arched with 7 (8) broad frames. The collar region is 

 generally biconical (33 in the upper and 35° in the lower 



